Unexpected reactivity of 1-amine-2-methylenenorbornane hydrochlorides with m-CPBA - Martínez, A.G.; Vilar, E.T.; Fraile, A.G.; de la Moya Cerero, S.; Ruiz, P.M.; Morillo, C.D.; Maroto, B.L. (Tetrahedron Letters, 2007)